Dos Standard Error
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Windows Standard Error
Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million linux standard error programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Redirect stdout and stderr to a single file up vote 358 down vote favorite 97 I'm trying to redirect all output
Dos Redirect Standard Error
(stdout + stderr) of a DOS command to a single file: C:\>dir 1> a.txt 2> a.txt The process cannot access the file because it is being used by another process. Is it possible, or should I just redirect to two separate files? windows command-line cmd pipe share|improve this question edited Oct 9 '15 at 19:39 Peter Mortensen 10.2k1369107 asked Sep 14 '09 at 11:20 ripper234 66.4k165464747 2 TechNet: Using command redirection operators dos stdin (answers this better than any of the answers here). –Martin Prikryl May 11 at 6:09 add a comment| 6 Answers 6 active oldest votes up vote 553 down vote accepted You want: dir > a.txt 2>&1 share|improve this answer answered Sep 14 '09 at 11:23 Anders Lindahl 24.7k55275 10 thanks for this, didn't know that this unix shell syntax works for DOS too! –chaindriver Aug 14 '12 at 17:00 11 this is great for hiding all output.. net stop w3svc >NUL 2>&1.. thanks! –wasatchwizard Apr 4 '13 at 17:55 1 @wasatchwizard Ithink I had trouble with that, but >NUL 2>NUL worked fine –FrinkTheBrave Aug 4 '14 at 8:24 4 If there is a Handle, there cannot be a space between the Handle (i.e. 2) and the redirect operator (i.e. >). Therefore 2> 2.txt works (or 2> &1) 2 > 2.txt does not; 2 > &1 does not. –The Red Pea Apr 3 '15 at 21:41 Reference document from Microsoft: support.microsoft.com/en-us/kb/110930 –Jonathan Benn Feb 3 at 18:58 | show 1 more comment up vote 101 down vote Anders Lindahl's answer is correct, but it should be noted that if you are redirecting stdout to a file and want to redirect stderr as well then you MUST ensure that 2>&1 is specified AFTER the 1>
4 – stdin, stdout, stderr Part 5 – If/Then Conditionals Part 6 – Loops Part 7 – Functions Part 8
Dos Redirect Stderr
– Parsing Input Part 9 – Logging Part 10 – Advanced Tricks
Dos Redirect Stderr To Null
DOS, like Unix/Linux, uses the three universal “files” for keyboard input, printing text on the screen, and the dos redirect stderr to stdout printing errors on the screen. The “Standard In” file, known as stdin, contains the input to the program/script. The “Standard Out” file, known as stdout, is used to write http://stackoverflow.com/questions/1420965/redirect-stdout-and-stderr-to-a-single-file output for display on the screen. Finally, the “Standard Err” file, known as stderr, contains any error messages for display on the screen. File Numbers Each of these three standard files, otherwise known as the standard streams, are referernced using the numbers 0, 1, and 2. Stdin is file 0, stdout is file 1, and stderr is file 2. http://steve-jansen.github.io/guides/windows-batch-scripting/part-4-stdin-stdout-stderr.html Redirection A very common task in batch files is sending the output of a program to a log file. The > operator sends, or redirects, stdout or stderr to another file. For example, you can write a listing of the current directory to a text file: DIR > temp.txt The > operator will overwrite the contents of temp.txt with stdout from the DIR command. The >> operator is a slight variant that appends the output to a target file, rather than overwriting the target file. A common technique is to use > to create/overwrite a log file, then use >> subsequently to append to the log file. SomeCommand.exe > temp.txt OtherCommand.exe >> temp.txt By default, the > and >> operators redirect stdout. You can redirect stderr by using the file number 2 in front of the operator: DIR SomeFile.txt 2>> error.txt You can even combine the stdout and stderr streams using the file number and the & prefix: DIR SomeFile.txt 2>&1 This is useful if you want to write both stdout and stderr to a
Challenges C# Getting Started Examples Development Software Books KiXtart Getting Started Examples Links Tools Books Perl Getting Started Examples Links Tools Books PowerShell Getting Started Examples Links Tools Books Regular http://www.robvanderwoude.com/redirection.php Expressions Getting Started Expressions Examples Links Tools Books Rexx Getting Started Examples OS/2 LAN Server Links Tools Books VBScript & WSH Getting Started VBScript Techniques Examples HTA & WSC Examples Links http://superuser.com/questions/452763/how-to-pipleline-stderr-in-cmd-exe Tools Books Challenges Technologies WMI Getting Started Examples Links Tools Books ADSI Getting Started Examples Links Tools Books Silent Installs General Windows Installer Specific Software Software Requirements Hardware Requirements Books Batch standard error Files Windows Resource Kits KiXtart Perl PowerShell Regular Expressions Rexx VBScript & WSH C# WMI ADSI HTML, JavaScript & CSS Off-Topic Scripting Tools Batch Utilities Resource Kits Compilers Editors Code Generators Regular Expressions Automation Tools VBScript Add-Ons Visual Studio Printing Tools Inventory Tools Shell Extensions File Viewers Backup Security The making Of... Miscellaneous Tweaks Web Stuff Conversions My Photo Galleries About This dos redirect stderr Site Disclaimer News FAQ Search What's New Objective Site Policy Your Preferences Credits The Making Of... Contact Failed Mail Donate Redirection Redirection command > file Write standard output of command to file command 1> file Write standard output of command to file (same as previous) command 2> file Write standard error of command to file (OS/2 and NT) command > file 2>&1 Write both standard output and standard error of command to file (OS/2 and NT) command >> file Append standard output of command to file command 1>> file Append standard output of command to file (same as previous) command 2>> file Append standard error of command to file (OS/2 and NT) command >> file 2>&1 Append both standard output and standard error of command to file (OS/2 and NT) commandA | commandB Redirect standard output of commandA to standard input of commandB commandA 2>&1 | commandB Redirect standard output and standard error of commandA to standard input of commandB (OS/2 and NT) command < file command gets standard input from file command 2>&1 command's standard error is redirected to standard output (OS
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Super User Questions Tags Users Badges Unanswered Ask Question _ Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top How to pipleline stderr in cmd.exe? up vote 2 down vote favorite Some programs would prefer to output the help message in stderr. I want to search the help message with grep command, xx /? | grep regex? How could i do this? windows command-line grep share|improve this question asked Jul 24 '12 at 3:30 Jichao 1,85072846 add a comment| 1 Answer 1 active oldest votes up vote 5 down vote accepted You can redirect stderr to stdout by using 2>&1, and then pipe stdout into grep. So, what I think you want is this: xx /? 2>&1 | grep regex share|improve this answer answered Jul 24 '12 at 4:03 martineau 3,2151124 what does &1 means? –Jichao Jul 24 '12 at 5:00 1 To specify redirection to existing handles, use the ampersand & character followed by the handle number that you want to redirect (that is, &handle#). stdin is handle #0, stdout is handle #1, and stderr is handle #2. –martineau Jul 24 '12 at 5:12 add a comment| You must log in to answer this question. Not the answer you're looking for? Browse other questions tagged windows command-line grep . asked 4 years ago viewed 1173 times active 4 years ago Related 0How to search for files and directories using a single find command2How do I grep help output in linux?0How to use Grep in Unix command line?4How to quickly save what is currently shown in cmd.exe to a file5output both stderr and stdout to file, and only stderr to command prompt0How to redirect a part of stderr and stdout to /dev/null1How to redirect ALL output from a command in Linux0How do I correctly return context from a gnu